docs: def generate_record_key(ase):
          # type: (blobxfer.models.azure.StorageEntity) -> str
          """Generate a record key
          :param blobxfer.models.azure.StorageEntity ase: Storage Entity
          :rtype: str
          :return: record key
          """
          key = '{}:{}'.format(ase._client.primary_endpoint, ase.path)
          if blobxfer.util.on_python2():
              return key.encode('utf8')
          else:
              return key